Photographic film for film-packs, changing-boxes, cameras, and the like.



J. E. THURNTON. Y PHOTOGBAPHIU FILM FOB FILM PACKS, CHANGING BOXES, CAMERAS. AND THE LIKE.

APPLICATION FILED IAY, 1907 Patented June 2, 1914.

PATENT FFCE.

JOHN E. THORNTON, OF ALTBINCHAM, ENGLAND. ASSIGNGR T FIREPRQOF FILM COMPANY, A CORPORATION G3? MAINE.

PHOTOGRAPHIC FILM FOR FILBTPACKS. CHANGINGBOXES. CAMERAS. AND THE LIKE.

Spcccation of Letters Patent.

Patented June 2, 1914.

Application led May 1907'. Serial No. 372,056.

Be it known that l, JOHN lflnwano '.limIiNTroN, British subject. and resident ot Altrincham, county oi. Chester,` England, have invented certain new and usetul lmprovements Relatingl to Photographie Films for 'Filth-'Packs Changing-Boxes, ftameras, and the like, oli' which the following is a specification.

'lhis invention relates to photograilihic films ot' the type Vin which an extension or tab is provided to 'facilitate the manipulation ot the tilm.

lli`ilms made according to this invention arc especially suitable t'or use in film-packs, wherein a number of lilms are contained in a sealed packet, which is inserted in the camera, the fili-ns being manipulated successively, after exposure, by means of the tabeXt-ensions provided for this purpose.

The object ot the present invention .isy to produce a tabbed film in which the layers ot material are so -formed, particularly at thc junction between the tab-extension and the body of the film, as to avoid pronounced edges or shoulders upon the superposed layers where they cross the tab-extension; and to this end l form the supcrposed layers in such a manner that at this point they taper in thickness to the surface of the tab-eXtension, or to a line substantially at the junction between the extension and the body of the film. 1While this may be accomplished in various ways, it is preferably and most simply accomplished by spreading the niaterial for such layers in liquid form upon a smooth support of glass or other material, and the fluid material so spread assumes naturally, as the result of surfacotension, a smoothly reduced or tapered form at its margin where itcrosses the tab-extension` thus avoiding a sharp edge and pronounced angle or shoulder such as would be produced by the use of a layer ot previously solidified material with cut or trimmed edges. y

lin the accompanying drawings z-Figure 1 is a perspective-view of a strip of films partially completed in accordance with the present invention; Fig, 2 is a partial section, upon a greatly enlarged scale, of a film embodying the invention; and Fig. 3 is a similar section, showing the invention in a modified form.

ln carrying out the present invention all ol the layers` inchidingl the celluloid base. may he made by spreadingl material in liquid formr upon a suitable smooth. clean support ot glass or other impervious mate; rial. To 'Form the structures shown in Figs. l and Q this support is iirst coated witlra layer 7 ot' gelatin. equal in v-:idth to the baseer bodv ot' the required film. lVhen this material has soliditied the layer T and the support are next coated with a la ver 5 ot Celluloid in liquid Vtorni. and finally a third layer (not sensitized emulsion, is superposed upon the celluloid. The layer (i is of only the width of the body ol the film` while the Celluloid layer is made enough wider to provide for the integral taheettensions. The entire strip may then he trimmed to produce the required outline and the integral tab-extensions 9. the product then having the appearance of Fig. l, and the several lms may then be cut apart on the dotted lines in Ithis figure, thus complet-ing the films. The tab-extensions may be of any required form, and thcy'are illustrated as having numbered tabs l0 to facilitatc the manipulation of the films, while similar tabs 1G project, for theI samey purpose, at the rear edges of the films. Owing lto the fact that the margins of both of the layers 6 and 7, where they cross the junction between the bodies 5 of the films and the tab-extensions 9 therefrom, are uncut, and have the form resulting niturally from the flowing of the liquid material when spread as above described, these marginsare smooth and tapered, as shown in a somewhat exaggerated mztnner at the points 11 in Fig, 2, and are terminated by edges which are firmly united to the celluloide layer withoutany pronounced angles or salient portions. Thepositions ot these edges are somewhat indefinite. but are iudicated approximately by the lines 8 in the drawings.

In place of formingthe talrextensions integral with the base-layer of celluloid, they may be formed integral with one of the layers of gelatin, or other materiah which are superposed upon the base; preferably with the gelatin backing. as shown in Fig. 3. ln this case a layer 18 `of gelatin solution material is first spread upon the support, this layer being' sutliciently wideto provide integral tab-extensions 14. To increase the thickness and strength of these extensions a second layer of similar material may then be spread, this layer being only of a Width corresponding to the required length of the tab-extensions. A layer 12 of Celluloid may then be spread upon the layer 125, terminating at the edge of the layer 1:5. Finally, a layer 6 of sensitized material may be spread upon the celluloid 12, extending slightly beyond the junction between the layers 12 and 14, as shown in Fig. 3. The material so formed may then be trimmed to shape as in Fig. 1, or in any required shape, the tab-extensions being formed from the layers 14 and l5 which, owing to the similarity of their materials and the method of their manufacture, are substantially integral.

I claim:

1. A tab-iilm consisting of a plurality of solidified coatings of cellulosic and colloidal solutions superposed one upon the other, one at least of which has a portion extended beyond the others to form a tab extension, the edges of the other coatings, Where they beyond that part of the ilm that is to bev exposed, to serve as a tab extension, the other coating or coatings being tapered at their margins adjacent the tab extension so as to avoid the production of a pronounced shoulder or edge at this point, substantially as shown and described.

In Wit-ness whereof, I have hereunto signed my name in the presence of two subscribing Witnesses.

J. E. THORNTON.

Witnesses:

J. OWDEN OBRIEN, B. TALHAM WooDHEAD. 

